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Toste Farms -3- May 5, 2009 <br /> Claim No. 14558 <br /> 1 <br /> A. Soil Excavation: unknown volume <br /> B. In-Situ Soil Remediation: none identified- <br /> C. Groundwater Remediation: <br /> • METHOD: ozone sparging <br /> • DURATION: Jun 04 through present <br /> D. Groundwater Trends: <br /> • MTBE trends are shown below <br /> ,"- <br /> s, METHYL--TERT-BUTYL,,ETHER'(?MTB'E) Results,for MW-7 <br /> — '45000 , :,I' 3 <br /> f -40000= — n <br /> i <br /> m 35000 — <br /> 30000 <br /> 7 <br /> .' 25060 - — — -- -- - a' <br /> y <br /> 20000- <br /> Cl) <br /> 0000.� a <br /> 75000 <br /> 7000Q. <br /> 4 <br /> 0. <br /> 500 . 13 <br /> - ,METHYL-TERT-BUTYL ETHER(MTBE),•�e'Depth'to Water <br /> VII. SENSITIVE RECEPTOR SURVEY: no wells identified'within Y2 mile of the site, <br /> VIII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: retail gasoline station' <br /> B. Site History: the extent of groundwater contamination-is defined <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: ozone sparging <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation:' <br /> In May 2008, the Fund made the following recommendation: 'The Fund <br /> recommends that the San Joaquin County LOP direct the Responsible Party <br /> assess the effectiveness of the current groundwater treatment system and <br /> maximize the system as necessary to achieve Water Quality Objectives in a <br /> timely manner. The Fund will review this site next year to track progress. <br /> UPDATED, May 2009: Based on the following criteria; the Fund. recommends <br /> this site be considered for closure providing a health hazard risk assessment is <br /> California Environmental Protection Agency <br /> �. Recvded Paper <br />